Maryland Math K.GR.A.3

MathKindergartenGeometric Reasoning and Measurement

The Standard

Order up to 3 objects by a measurable attribute (e.g. greatest to least in height).

Maryland College and Career Ready Standards for Mathematics (2025) · DESCRIBE AND COMPARE MEASURABLE ATTRIBUTES.

Teacher's field guide

What Students Need to Do: Students compare three objects using one feature they can measure, such as height or length. They put the objects in order from least to greatest or greatest to least.
What Mastery Looks Like: A student lines up three pencils at one end and orders them from shortest to longest. They can point to the shortest, longest, and middle pencil.
Common Misconceptions: Students may compare pencils without lining up their ends, making one look longer than it is. They may switch from height to width partway through ordering.
How to Assess It: Give each student three paper strips of different lengths. Ask them to line up one end, order the strips from shortest to longest, and point to the middle strip.

Lesson moves

Build three block towers on the same table, then have students place them in order from shortest to tallest.
Show three pencils with their ends lined up and ask, "Which pencil goes in the middle by length? How do you know?"
Give pairs sets of three paper strips to order from longest to shortest, then have them swap sets and check each other.
Set three classroom water bottles on a table and ask students to order them by height for a shelf display.

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